Window Options Menu /Border style

["Edwards, Mac" <Edwards mtx com>]

Please help a novice.

The "Window Option Menu" can be invoked by clicking the icon in the top
left-hand corner of most Gnome/Gtk app windows.  This menu has an option
to 'Set Border Style'.  If 'Shaped' is selected as the style, the
borders will
removed from the window.  
I would like to be able to accomplish the removal of borders and other
decorations from within my code. Actually, I would like to remove
borders
when my window maximizes and put then back on when the window is
restored.
I have tried using 'gdk_window_set_decorations(window,0)' with
no success. 
My app was generated by Glade with Gnome support.

Suggestions?